Dynamo-electric machine.



Patented Apr. 10, 1917.

E. D. PRIEST.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED ocT. 5. IQI/I.

WItnessesi H 1 C t n IS T Tm@ 0 mw u n A e VD nd ...I Ir .a W wlw I M EE. D. PRIEST.

DYNAMO ELECTRIC MACHINE.

APPucATmN FILED ocT. 5. 1914.

1,222,465. Patented Apr. 10,1917.

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Witnesses: Im/entor:

U Edward D Priesty w b5 hnsmomeg.

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Patented Apr. 1o, 1917.

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To all whom it may concern:

Be it known that I, EDWARD D. PRIEST, a citizen of the United States,residing at Schenectady, in the county of Schenectady, State of NewYork, have invented certain new and useful Improvements in Dynamo-Electric Machines, of which the following is a specification. v

My invention relates to dynamo ,electric machines of the commutatortype, the field members of which are providedvwith definite poles, andparticularly to the ventilation ofsuch machines, and has for its objectto increase to a maximum the amount of cooling air blown through themachine, and thereby make it possible to greatly increase the output ofthe machine, or to reduce the size of the machine and obtain the sameoutput as heretofore. To this end my invention consists in certain novelfeatures of construction and arrangement of parts hereinafter described,and particularly pointed out in the claims.

For a better understanding of my invention reference may be had to thefollowing description taken in connection with the accompanyin drawingsin which Figure 1 is a longitudinal cross-section of a dynamo electricmachine embodying my invention; Figs. 2 and 3 are elevation views of theends l of the machine of Fig. 1; Fig. 4 is a longil:als

tudinal cross-section of a dynamo electric machine embodying amodification of my invention taken on the line 4-4 of Fi 5, and Figs. 5and 6 are elevation views o the ends of the machine of Fig. 4.

In the drawings, I have shown my invention applied to railwayv motors towhich it is particularly applicable. My invention is not limited to`such machines, however, and it may be used in any type of dynamoelectric machine.

Referring to Figs. 1, 2 and 3 of the drawings, 1 is an inclosing casingof a dynamo electric machine which is provided with inlet openings 2 andoutlet openings 3. Project? ing from the casing 1 are definite fieldmagnet poles 4 on which are mounted windings 5. A shaft 6 is journaledin bearings in t e casing and mounted thereon is a rotatable member orarmature 7 provided with windings 8 and having longitudinal air passages9 extending therethrou h. Mounted on the shaft 6 at one end of t erotatable member are inner and outer radial fan members 11 and 12,extending beyond the periphery of draw air through the inlet `,openingsthe armature 7. The casing 1 is rovided with a flange 10 adjacent to theout et openings 3 and located between the outlet openings and the fieldwindi 5 and which cooperates with the perip ery of the inner fan member11 at the inner end thereof, to prevent the rentrance of heated air intothe casing and the formation of edd currents in the outlet passageconnecting t e periphery of the fan members with the outlet openings 3.These fan members are arranged to 2 to force the air in' two parallelpaths throiigh the machine and exhaust it through the outlet openings 3,one of the paths being over the windings 5 between the field poles 4 andover the exterior surface of. the rotatable member 7 and the other ofsaid paths being throu h the longitudinal passages 9 in the rotata lemember.

The armature 7 is provided with a. commutator structure 13 at one endthereof which has longitudinal air passa 14 therethrough whichcommunicate with the passages 9 in the armature 7. The armature 7comprises laminations 15 which are held between end heads 16 and 17. Theend head 17 at the end of the armature away from the commutatorstructure has a flange 18, on one side of which is mounted the fan 11and on the other side of which is mounted the fan 12. The fan 11 extendsbeyond the periphery ofthe armature and the fan 12 is preferably alsosimilarly extended as shown in the drawing, since its effectiveness isthereby increased. The inner fan 11 draws air through the inlet openings2,

forces it over the field windings 5 between the field poles and over theexterior surface of the commutator and armature and out through theoutlet openings 3. The intake opening of the outer fan 12 on the `otherside of the fiange communicates only with the paages in the armature andcommutator structure. This fan draws air throu h the inlet openings 2,forces it through t e longitudinal passages 14 in the commutatorstructure, the longitudinal passages 9 in the armature and out throughthe outlet openings 3. From this it will be seen that the amount ofcooling air blown throu h the machine is a maximum and that t e air isblown both over and under the parts that are liable to become thehottest. By providing two distinct and parallel paths for the coolingair, each with its own fan,

it is possible by properly proportioning the parts tp the cooling airbetween the field coils and the interior of the armature and commutatorstructure.

It will be seen from Fig. 1 of the drawings that the outer portion ofthe end head 16 overlaps the commutator structure and thus makes a jointthrough which air and dirt can not be drawn and at the same time centersthe commutator. The end of the shaft 6 is provided with a pinion 19 bywhich motion is transmitted from the armature shaft to an axle 20 bymeans of a suit able gear, not shown.

The inlet and outlet openings 2 and 3 are vshown as being provided withscreens in order to prevent the entrance of dirt or other materials intothe machine.

The construction shown in Figs. 1, 5 and 6 of the drawings issubstantially like that of the other figures of the drawings with theexception of the position of the inlet opening 21 and the outletopenings 22 in the inclosing casing l. This casing has mounted therein afield member L1 provided with windings 5. A shaft 6 is journaledinbearings in the casing and has mounted thereon an armature 7 providedwith windings 8 and a commutator structure 13. The armature haslongitudinal passages 9 communicating with longitudinal passages 14: inthe commutator structure. The end head 17 at the end. of the armatureaway from the commutator structure has a iange 18 on one side of whichis mounted fan 11 and on the other side of which is mounted the fan 12.A flange 10 is provided on the motor casing 1' adjacent to the outletopenings 22 which coperates with the periphery of inner fan 11 at theinner end thereof for the same purpose as pointed out in connection withthe fiange 10 in Fig. 1. The fan 11 draws air through the inlet opening21, forces it over the field windings 5 between the field poles and overthe eX- terior surface of the commutator and armature and out throughthe outlet openings 22. The, intake opening of the fan 12 on the otherside of the flange communicates only with the passages in the armatureand commutator structure. This fan draws air through the inlet opening21, forces it through the longitudinal passages 14: in the commutatorstructure, the longitudinal passages 9 in the armature and out throughthe outlet openings 22. This construction affords a protectionagainstthe entrance of dirt or moisture into the interior of the machine and isparticularly useful in connection with railway motors which operateunder street cars, as suchmotors are always located close to the surfaceof the street and are liable to have water splashed upon them. Theoutlet openings 22 in these figures of create any desired distributionof the drawings are shown as being located in the end of the casinginstead of 'in the side of the casing as in Fig. 1 and are covered byscreens which are spot welded in place.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is

1. A dynamo electric machine comprising an inclosing casing providedwith inlet and outlet openings in opposite ends thereof, field magnetpoles projecting from said casing, field windings on said poles, a shafthaving bearings in said casing, an armature mounted on said shaft andprovided with a commutator structure at one end, said armature andcommutator structure having longitudinally extending communicating airpassages therethrough, inner and outer radial fan members carried bysaid armature shaft at one end of said armature, said inner fan memberextending beyond the periphery of the armature. and adapted to draw airinto the dynamo electric machine through said inlet opening or openingsand to force it over said field windings between said field poles andover the exterior surfaces of said commutator and armature and outthrough said outlet opening, said outer fan member having an intakeopening communicating only with the passages in the armature andcommutator structure, and a fiange carried by said casing adjacent tosaid outlet opening or openings cooperating with the periphery of saidinner fan member at the inner end thereof.

2. A dynamo electric machine comprising an inclosing casing providedwith inlet and outlet openings in opposite ends thereof, field magnetpoles projecting from said casing, field windings on said poles, a shafthavingbearings in said casing, an armature mounted on said shaftprovided with a commutator structure at one end, saidarmature andcommutator'structure having longitudinally extending communicating airpassages therethrough, inner and outer radial fan members carried bysaid armature shaft at the end of said armature away from saidcommutator structure, said inner fan member extending beyond theperiphery of the armature and adapted to draw air into the dynamoelectric machine through said inlet openingr or openings and to force itover said field windings between said field poles and over the exteriorsurfaces of said commutator and armature and out through said outletopening, said outer fan member having an intake opening communicatingonly with the passages in the armature and commutator structure, and aiange carried by said casing adjacent to said outlet opening or openingscoperating with the periphery of said inner fan member at the inner endthereof.

3. A dynamo electric machine comprising an inclosing easing providedwith inlet and outlet openings in opposite ends thereof, eld magnetpoles projecting from said casing, field windings on said poles, a shafthaving bearings in said casing, an armature mounted on said shaftprovided with a commutator structure at one end, said armature andcommutator structure having longitudinally extending communicating airpassages therethrough, an end head at the end of said armature away fromsaid commutator, said end head having a fiange extending beyond theperiphery of the armature, inner and outer radial fan members, onemounted on one side of said fiange and the other mounted on the otherside of said flange, said inner fan member being adapted to draw airinto the dynamoelectric machine through said inlet opening or openingsand to force itover said field winding between said field poles and overthe exterior surfaces of said commutator and armature and out throughsaid outlet opening, said outer fan member having an intake openingcommunicating only with the passages in the armature and commutatorstructure, and a flange carried by said casing adjacent to said outletopening or openings cooperatingl with the periphery of said inner fanmember at the inner end thereof.

4. A dynamo electric machine comprising an inclosing casing providedwith inlet and outlet openings in opposite ends thereof, field magnetApoles projecting from said casing, field windings on said poles, ashaft having bearings in said casing, an armature mounted on said shaftand provided with a commutator structure at one end, said armature andcommutator structure having longitudinally extendin communicating airpassages therethroug radial fan members carried by said armature shaftat one end of said armature, one of said fan members extending beyondthe periphery of the armature and adapted to draw an' into vthe dynamoelectric machine through said inlet opening or openings and to force itover said field windings between said field poles and over the exteriorsurfaces of said commutator and armature and out through said outletopening, another of said fan members having an intake openingcommunicating only with the passages in the amature and commutatorstructure, and a flange carried by said easing between said outletopening or openings and said field windings cooperating with theperiphery of si first mentioned fan member.

5.' A dynamo electric machine com rising an inclosing casing providedwith in et and outlet openings in opposite ends thereof,

"field magnet poles projecting from said casing, field windings on saidpoles, a shafthaving bearings in said casing, an armature mounted onsaid shaft provided with a commutator structure at one end, saidarmature and commutator structure having longitudinally extendingcommunicating air passages therethrough, radial fan members carried bysaid armature shaft at the end of said armature away from saidcommutat'r structure, one of said fan members exten ing beyond theperiphery of the armature and adapted to draw air into the dynamoelectric machine through said inlet opening or openingsand to force itover said field windings between said field poles and over the exteriorsurfaces of said commutator and armature and out through said outletopening, another of said fan members having an intake openingcommunicatin only with the passages in the armature an commutatorstructure, and a fiange carried by said casing between said outletopening or openings and said field windings coperating with theperiphery of said first mentioned fan member.

6. A dynamo electric machine comprising an inclosing casing providedwith inlet and outlet openings in opposite ends thereof, field magnetpoles projecting from said casing, field windings o-n said poles, ashaft having bearings in said casing, an armature mounted on said shaftprovided with a commutator structure at one end, said armature andcommutator structure having longitudinally extending communicating airpassages therethrough, an end head at the end of said armature away fromsaid commutator, said end head having a ange extending beyond theperiphery of the armature, radial fan members, one mounted on one sideof said flange and the other mounted on the other side of said fiange,the one fan member being adapted to draw air into the dynamo electricmachine through said inlet openin or openings and to force it over saidfie d winding between said field poles and over the exterior surfaces ofsaid commutator and armature and out throu h said outlet opening, theother fan member avin an intake opening communicating only witg thepassages in the armature and commutator structure, and a fiange carriedby said casing between said outlet opening or openings and said fieldwindings coperating with the periphery of said firstv mentioned fanmember.

In witness whereof, I have hereunto set my hand this 2nd day of October,1914.

' EDWARD D. PRIEST.

Witnesses:

H. L. ANDREWS BENJAMIN B.

